Xcode 4.5 background image iPhone 4, 4s, 5

问题:

I have in my viewController.m written the background code:

self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"image.png"]];

And I have the correct names of the different pictures:

image.png for non-retina display (320x480)

[e-mail] for retina display (640x960)

[e-mail] for iPhone 5 (640x1136)

But when I run it in the simulator it does not take the [e-mail] for iPhone 5 screen it only takes the image@2x for 4s screen and scale it to fit the screen... I dont know if there is any coding to use the image-568h@2x for iPhone 5 screen?

Im using Xcode 4.5

回答1:

iPhone 5 is retina, just like iPhone 4 and 4S, and the @2x-image will be used automatically for all these devices. It's only the startup-image that is called "-568h@2x" for iPhone 5. You need to write some code to use a different image, something like this would work:

NSString *filename = @"image.png";
CGRect screenRect = [[UIScreen mainScreen] bounds];
if (screenRect.size.height == 568.0f)
    filename = [filename stringByReplacingOccurrencesOfString:@".png" withString:@"-568h.png"];

imageView.image = [UIImage imageNamed:filename];

回答2:

if you are trying to use [UIImage imageNamed:@"image.png"] and expect [e-mail] to be picked automatically from the bundle for iPhone 5, it will not work. Automatic picking works only for iPhone 4 and 4S.

Only the Default image named as [e-mail] will be picked automatically in iPhone 5.

for normal images, if you have separate image for iPhone 5, try using this code

CGRect screenBounds = [[UIScreen mainScreen] bounds];
if (screenBounds.size.height == 568) {
    // code for 4-inch screen
} else {
    // code for 3.5-inch screen
}

回答3:

I believe it is incorrect to assume that you can apply the -568h@2x trick to all image files. I think it only works for [e-mail]. This is the file that iOS looks for at app launch on a 4" display device, as well as the "flag" to enable 4" display support in the SDK. For example, once you include this specific file, your table views will fill the screen.

I have not read anything to suggest that you can simply provide any image with the -568h@2x file name component and have it be used automagically. You'll have to do that yourself based on the screen size, e.g. [UIScreen mainScreen].bounds.size.height.